The Origin of Species by Means of Natural Selection: The Descent of Man and Selection in Relation to SexEncyclopædia Britannica, 1955 - 659 стор. |
З цієї книги
Результати 1-3 із 56
Сторінка 82
... struggle for life , or more difficult — at least I have found it so - than constantly to bear this conclusion in mind . Yet unless it be thoroughly engrained in the mind , the whole economy of nature , with every fact on distribution ...
... struggle for life , or more difficult — at least I have found it so - than constantly to bear this conclusion in mind . Yet unless it be thoroughly engrained in the mind , the whole economy of nature , with every fact on distribution ...
Сторінка 83
... struggle with each other . As the mis- tletoe is disseminated by birds , its existence depends on them ; and it may metaphorically be said to struggle with other fruit - bearing plants , in tempting the birds to devour and thus ...
... struggle with each other . As the mis- tletoe is disseminated by birds , its existence depends on them ; and it may metaphorically be said to struggle with other fruit - bearing plants , in tempting the birds to devour and thus ...
Сторінка 576
... Struggle for Existence , we see a powerful and ever - acting form of Selection . The struggle for existence inevitably follows from the high geometrical ratio of increase which is common to all organic beings . This high rate of ...
... Struggle for Existence , we see a powerful and ever - acting form of Selection . The struggle for existence inevitably follows from the high geometrical ratio of increase which is common to all organic beings . This high rate of ...
Зміст
Historical Sketch | 5 |
Introduction | 17 |
Difficulties of the Theory | 197 |
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Загальні терміни та фрази
adapted admit affinities allied species analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied color continent crossed crustaceans degree developed difficulty distinct species divergence doubt effects eggs embryo existing extinct extremely facts favorable fertility fishes flowers formation forms fossil genera genus geological geological periods Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner Marsupials migration Mivart modified descendants natural selection naturalists nearly nest occasionally occur offspring organs parent perfect pigeon pistil pollen present principle probably produced quadrupeds races ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed tend theory tion trees variability variations varieties vary whilst whole widely different wings young
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